In a hypothetical study, 1000 patients attending a hospital general outpatient department were tested for diabetes using the following two tests:
Fasting blood sugar (FBS)
Glucose tolerance test (GTT)
There were 100 patients who had a positive GTT, and they were classified as true cases of diabetes. There were also 140 patients with an FBS of at least 6 mmol/l (the cutoff point to distinguish people with diabetes from those who do not have diabetes). Among these 140 patients, only 98 were true cases of diabetes (i.e. only 98 had a positive GTT as well).
a)Fill up the table:-
Diabetes (GTT)
FBS Positive Negative Total
+ve
-ve
Total
b) What is the meaning of 'cut-off point'??
cutoff point = In capital budgeting, the minimum acceptable rate of return on an investment.
Sra
154
A) 58.3%
B) 41.1%
C) 50%
D)49.5%
Don't know show me
To fill up the table, we need to calculate the totals for each category.
a) Fill up the table:
```
Diabetes (GTT)
FBS | Positive | Negative | Total
Positive | 98 | ? | 140
Negative | ? | ? | ?
Total | 100 | ? | 1000
```
To calculate the missing values, we can use the information provided in the question.
1. From the given information, there were 100 true cases of diabetes (positive GTT) out of 1000 patients. Therefore, the total number of negative GTT cases would be 1000 - 100 = 900.
2. From the given information, 140 patients had an FBS of at least 6 mmol/l. Out of these, 98 were true cases of diabetes (positive GTT). To find the number of negative GTT cases among the FBS positive patients, we can subtract the true GTT positive cases from the total FBS positive cases: 140 - 98 = 42.
Using these values, we can fill up the table:
```
Diabetes (GTT)
FBS | Positive | Negative | Total
Positive | 98 | 42 | 140
Negative | 2 | 858 | 860
Total | 100 | 900 | 1000
```
b) The "cut-off point" refers to a specific value or threshold used to distinguish between different groups or categories. In this context, the cut-off point of 6 mmol/l is used to distinguish between patients with diabetes and those without. If a patient's FBS is equal to or higher than 6 mmol/l, they are classified as having diabetes. The cut-off point helps in determining the diagnosis or classification based on the test results.